Carbon pencil of electric-arc lights.



Patented 0692714908.

J. NICHOLSON. CARBON PENCIL OF ELECTRIC ABC LIGHTS.

APPLICATION FILED APR. 20, 19C!!1 wir nous JOHN NICHOLSON, OF FRAGKVILLE, PENNSYLVANIA.

CARBON PVENGIL OF ELECTRIC-ARC LIGHTS.

`Specification of Letters Batent.

y Patented Oct. 27, 1908.

v pinceau mea April zo, 190s. serial nu. 42eme.'

- To all inkom 'it may concern:

Be it known that I, JOHN Nrcnonson, a citizen of the United States, resldmg at `'I4`rackville, in the county of Schuylkill and State of Pennsylvania, have invented certain new and use ful Improvements iuCarbon Pencils of Electric-Arc Lights, of which the l following is a specification.

My invention-relates to carbon pencils of electric arc lights and particularly tothe -lower carbon of lower electrode.i

My invention relates more specifically to the cored lower electrode of the so called luminous arc light. e

AMy invention will be more readily uncerstood by reference to the accompanying drawin which is' a. longitudinal sectional E an electrodeembodying iny invention in its preferred form.-

Referring nowV to the drawings, 1 indicates a carbon pencil which is designed as the lower electrode of? an arc light. This 'is centrally cored as at 2, and filled with a suitable mixture as at 3, which is composed lof any of the substances now used for this purpose.

- The end is closed or covered by a ca 4. Thisis formed of a diskof thin sheet 1ron and is held in place by a metal strip 5, which is secured to the center of the underface .ofV

the disk and extends substantially centrally through the core 3. The substance of which the core is composed is a non-conductor or at the best a poor conductor. For obvious rear,

rectly through the core or to establish a circuit through the member 5, hence the strip '5 terminates some distance from the socket end| of the electrode or pencil. The member 5, is formed preferably of iron wire, Number 14 gage being found by experiment to be A the most suited'for the purpose. VfIhe pencil is completed by a cylindrical jacket 6, incasing the carbon 1, and formed of thin sheet iron.

Having thus described my invention what I claim as new and desire to secure by Leti ters Patent is `1. An electrode for an arc light compris ing a cored carbon pencil having a metal cap and a 'metal strip secured to said cap and extending 4 substantially centrally through the core, s'ubstantiallyfas described.

2, An electrode foran arc light comprisL ing a cored carbon pencil having a metal cap and a metal strip secured to said cap and eX- tending centrally through said core and terminating at a. distance from the socket end, substantially as described.

3. An electrode for an arc light comprising a cored carbon pencil having a metal cap and a metal jacket,` substantially as described.-

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

. JOHN NICHOLSON.

Witnesses:

SAM. I. STEINBAGH, C. W. TRAUTMAN. 

